I' d suggest a potential repair method, but it sounds like you' ve got scaler failure, and the success rates for DIY solder reflowing is quite poor, so I wouldn' t bother voiding your warranty. I don' t condone warranty fraud, so I won' t post anything to ring out your box effectively. Check your PM inbox anyhow.
Here’s hoping my new generation 360 (now with HDMI slot!) lasts the test of time.
Having an HDMI slot doesn' t assure you' ve got the new 65nm process Falcon chipset/heatsink combo necessarily, especially if you' re buying stock that' s been on shelves for a while. If you do decide to buy one, tell the clerk that you' d like to look at the box before purchasing. If they want to make the sale, they won' t object.
Take a look at the bar-code sticker on the back bottom righthand (?) side of the box. You should see bar codes, serial numbers and all kinds of groovy things.
First find the manufacture date. Somewhere in mid-August they stopped manufacturing the old mobo/heatsink combo. If it' s before, or even
in August, I wouldn' t take it.
Next look at the LOT number; should be on the righthand side of the sticker. You want a box that is at least from LOT#734, if not higher.
The same sticker will tell you what your PSU wattage is. The Falcons distinctively have a 175w PSU.
If you can get all three of these, you' re golden, if you can only get an August box with the right LOT and PSU figures, you' re still good too.